An economic survey of ancient Rome. - Frank, Tenney, 1876-1939; Haywood, Richard Mansfield, 1905-; Heichelheim, Fritz M. (Fritz Moritz), 1901-1968; Larsen, J.A.O; Broughton, T. Robert S. (Thomas Robert Shannon), 1900-1993 (The Johns Hopkins Press, 1938)